Lifters Part 2

I seriously doubt you need to replace any of the valves or lifters. The previous owner may have used some bad oil or oil additive that is sludging up the works. If your local mechanic has the Bilstein engine flush, I would try to clear the sludge first.

hello, if that's 105,000 miles then you are so fortunate to have gotten this far ! you feel he might have lied ?????? NO ! note: it probably wasn't raced or abused and this could be your problem . anyway , you are long overdue for the repair . regards, d.

do you know about : www.performanceproducts com ?

Actually, the 944 engine should go 250,000 miles before you need to any valve work.

Why?

What could be my problem?

Like I said...I seriously doubt it. I have owned/worked on 944's since the late 80's and have never heard of a needed rebuild at 105K. Flush the engine, run 10/40 or 20/50 and see how it goes.

Thanks for the heads up, i'll look for a local shop that has a Bilstein flush system or something similiar...sounds like a good cleaning is all it might need.

Err wait, I think i'll just drop a Chevy V8 instead!

....NOT

..and you thought your top end was loud now!!!

Used to have the same exact problem on my 84 944 na. Tried numbeous oils and additives. Finally settled on Valvoline single weight 30. No more problems. I have over 300,000 miles on this engine and it runs perfectly with no valve noise.

MV oil has an oxidizer to make the oil viscosity increase with temperature. When a MV oil flows around a hot spot such as valve stem etc it gets too thick and lubrication is decreased locally. Final result is damaged valves.

Actually, they have polymers in them to keep the absolute viscosity from going too low. At higher temps oil, even multiweight, get thinner, not thicker. Porsche specifies multiweight oil for the motor for good reason, less startup wear, and good hot protection. When changed at proper intervals, and the correct weight is used for the temperatures, it work just fine. Given that pretty much every car made in the last

MV oils are designed to reach a nominal viscosity at average engine ambient temperature. Hot zones in the engine will make the MV oil go over posted viscosity. I have observed this directly in operating engines. In one instance the oil became so thick around the valve guide that lubrication failed, the valve seized from metal flowing and the engine stopped. 10w 50 oil. I have been driving and repairing engines for over 55 years. Use Valvoline single weight oils and your engines will last.